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Coulomb's or Rankine Active Earth Pressure Coefficient,
Pressure, Horizontal Resultant and Moment: |
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The Rankine formula for earth pressure differs from Coulomb's by ignoring the friction between the wall and the backfill, AngF = 0.0 degrees. |
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Calculation: |
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Designer/Checker: |
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Input: |
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(Note: All input Metric units are converted to English units
for the equations below and then the output English units are converted back to
Metric) |
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*Angle of backfill slope, (AngB - degrees) |
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Angle of back of wall to horizontal, (AngWall - degrees) |
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Angle of friction between the wall and the backfill, (AngF - degrees)** |
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Height from bottom of heel to top of slope (H - ft or m) |
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Density of soil (d - pcf or kg/m^3) |
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*Angle of internal friction (AIF - degrees) |
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Cohesion of the soil (c - psf or kPa) |
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*In order for this equation to apply, AngB <= AIF.
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**For Rankine formula use AngF = 0.0.
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Output: |
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Active earth pressure coefficient, ka = |
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Active earth pressure, pa = |
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Active earth pressure Resultant, Ra = |
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Active earth pressure Moment, Ma = |
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